A train 400m long is running at a speed of 40km/h.How long will it take to cross 800m long?
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Speed = 40 km/h
= 40 *5/18 m/s
Time required to cover 400m =( 400 * 18)/(40*5) = 36 sec
Time required to cover 800m = (36 * 400+800)/400
= 108 sec [Ans]
= 40 *5/18 m/s
Time required to cover 400m =( 400 * 18)/(40*5) = 36 sec
Time required to cover 800m = (36 * 400+800)/400
= 108 sec [Ans]
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